Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 3	$ 17
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	10	8
Tax on decrease in net actuarial losses	1	(1)
Tax on deferred derivative gains (losses)	(2)	(1)
Tax on deferred derivative gains (losses) reclassification adjustment for amounts recognized in income	$ (1)	$ (1)